Welcome to the Piano World Piano ForumsOver 2.5 million posts about pianos, digital pianos, and all types of keyboard instruments
Join the World's Largest Community of Piano Lovers
(it's free)
It's Fun to Play the Piano ... Please Pass It On!

I think it has been more or less standardfrom the earliest times, since the sizeof the ends of people's fingers has notchanged. For example, I saw an ancient organ on tv and the rough-hewn woodenkeys looked the same size as on a modern piano. A modern piano player would thus have no problem playing any keyboard instrument from any era.